SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                         ----------------------------

                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


 Date of Report (Date of earliest event reported): March 8, 2004 (March 8, 2004)

                                 Arch Coal, Inc.
             (Exact name of registrant as specified in its charter)

  Delaware                           1-13105                    43-0921172
--------------------        ---------------------------         ----------
(State or other jurisdiction  (Commission File Number)       (I.R.S. Employer
    of incorporation)                                       Identification No.)


            One CityPlace Drive, Suite 300, St. Louis, Missouri 63141
               (Address of principal executive offices) (Zip code)


       Registrant's telephone number, including area code: (314) 994-2700











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                         Exhibit Index begins on page 4.





Item 5. Other  Events.

     On March 8, 2004,  Arch Coal,  Inc.  (the  "Company"),  announced via press
release that it has agreed to sell Triton Coal Company's Buckskin mine to Kiewit
Mining  Acquisition  Company for a purchase price of $82.0  million,  contingent
upon the Company's  acquisition of Vulcan Coal  Holdings,  which owns all of the
equity of Triton Coal Company.


Item 7.  Exhibits.

         (c) The following Exhibit is filed with this Current Report on Form
8-K:

          Exhibit No.               Description
            99                        Press Release dated as of March 8, 2004


























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                                   SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

Dated:  March 8, 2004                       ARCH COAL, INC.



                                         By:    /s/ Janet L. Horgan
                                            ------------------------------------
                                               Janet L.Horgan
                                               Assistant General Counsel and
                                                Assistant Secretary



























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                                  EXHIBIT INDEX


Exhibit No.                 Description
-----------                ------------
99                         Press Release dated as of March 8, 2004


































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                                                                      Exhibit 99

News from
Arch Coal, Inc.
--------------------------------------------------------------------------------
                                                        FOR FURTHER INFORMATION:

                                       Media Relations - Kim Link (314) 994-2936
                                  Investor Relations - Deck Slone (314) 994-2717

                                                           FOR IMMEDIATE RELEASE

                 Arch Coal Discloses Agreement To Sell Triton's
            Buckskin Mine, Contingent Upon the Acquisition of Vulcan


     ST.  LOUIS  (March 8, 2004) - In its 2003 annual  report  being filed today
with the  Securities  and  Exchange  Commission,  Arch Coal,  Inc.  (NYSE:  ACI)
disclosed  that it had signed an  agreement  in late January to sell Triton Coal
Company's  Buckskin  mine to Kiewit  Mining  Acquisition  Company for a purchase
price of $82.0 million.  The  transaction  is contingent  upon the completion of
Arch's  acquisition  of Vulcan  Coal  Holdings,  which owns all of the equity of
Triton Coal Company.

     On May 29, 2003, Arch Coal signed a definitive  agreement to acquire Vulcan
Coal  Holdings LLC. That  transaction  is currently  under review by the Federal
Trade  Commission.  Triton is the nation's seventh largest coal producer and the
operator of the North  Rochelle  and Buckskin  mines in  Wyoming's  Powder River
Basin.

     The Federal Trade  Commission was informed in early December 2003 that Arch
was  contemplating  the sale of the  Buckskin  mine to  Kiewit  Mining,  and was
subsequently notified in late January 2004 that an agreement had been signed.

     The North  Rochelle  mine  shares a  5.5-mile  property  line  with  Arch's
existing Black Thunder mine. The potential  future  integration of the two mines
creates tremendous opportunities for cost savings and synergies.

     Kiewit  Mining  Acquisition  Company is a subsidiary  of Peter Kiewit Sons'
Inc.'s Kiewit Mining Group, located in Omaha, Neb.

     St.  Louis-based Arch Coal is the nation's second largest coal producer and
mines  low-sulfur coal  exclusively.  Through its subsidiary  operations in West
Virginia, Kentucky, Virginia, Wyoming, Colorado and Utah, Arch provides the fuel
for approximately 6 percent of the electricity generated in the United States.





Forward-Looking  Statements:  Statements  in this  press  release  which are not
statements of historical fact are  forward-looking  statements  within the "safe
harbor" provision of the Private Securities Litigation Reform Act of 1995. These
forward-looking  statements are based on information currently available to, and
expectations and assumptions  deemed  reasonable by, the company.  Because these
forward-looking  statements  are  subject  to various  risks and  uncertainties,
actual results may differ  materially  from those  projected in the  statements.
These  expectations,   assumptions  and  uncertainties  include:  the  company's
expectation  that it will be able to consummate  its  acquisition of Vulcan Coal
Holdings ; and the other risks and  uncertainties  which are described from time
to  time in the  company's  reports  filed  with  the  Securities  and  Exchange
Commission.